160 results about "Selenate" patented technology

The present invention is directed to systems and methods of treating wastewater. The present invention may include a method of treating such wastewater comprising selenium in the form of water soluble selenates, selenites, and / or selenides, the method including: a chemical / biological treatment process, causing the water soluble selenates, selenites, and / or selenides in the wastewater to be converted into insoluble elemental selenium; and a physical treatment process, trapping the insoluble elemental selenium in a filtration device. Systems and methods in accordance with the present invention may also include a system for including: one or more chemical / biological treatment reactors, the one or more chemical / biological treatment reactors configured to cause the water soluble selenates, selenites, and / or selenides in the wastewater to be converted into insoluble elemental selenium; and one or more physical treatment devices, the one more physical treatment devices configured to trap the insoluble elemental selenium in a filtration device.

A biological system for removing selenium from waste water comprises a first immobilized cell bioreactor (ICB) and a selenide removal module. The first ICB comprises a chamber having a substrate housed therein and situated to contact the waste water flowing therethrough during use. Anaerobic microorganisms are supported on the substrate, and comprise selenium respiring bacteria capable of reducing selenates and selenites to insoluble elemental selenium and / or sulfate reducing bacteria capable of reducing selenates and selenites to insoluble elemental selenium or to soluble selenides. The selenide removal module includes metallic or oxidized iron compounds capable of chemically reacting with selenide or sulfide compounds in the waste water to form iron selenide or iron sulfide precipitates.

An improved water decontamination process comprising contacting water containing anionic contaminants with an enhanced coagulant to form an enhanced floc, which more efficiently binds anionic species (e.g., arsenate, arsenite, chromate, fluoride, selenate, and borate, and combinations thereof) predominantly through the formation of surface complexes. The enhanced coagulant comprises a trivalent metal cation coagulant (e.g., ferric chloride or aluminum sulfate) mixed with a divalent metal cation modifier (e.g., copper sulfate or zinc sulfate).

The invention discloses a compound selenium Chinese medicinal composition for treating cardiovascular and cerebrovascular diseases and a preparation method thereof. The Chinese medicinal composition comprises the following extract components of Chinese herb medicines in part by weight: 10 to 85 parts of natto extract, 0.5 to 6 parts of polysaccharide selenate, 15 to 90 parts of kudzuvine root, 20 to 95 parts of grape seed extract, 20 to 90 parts of green tea extract, 25 to 110 parts of sea buckthorn extract, 25 to 95 parts of fructus crataegi extract, 10 to 90 parts of notoginseng root extract, 10 to 95 parts of ginkgo biloba extract and 25 to 100 parts of garlic extract. The Chinese medicinal composition is prepared from the various components according to the principle of promoting blood circulation and removing blood stasis, resolving phlegm, dissolving emboli and decreasing blood-lipid, removing toxin, purifying blood, repairing vessels, and promoting qi circulation and removing obstruction in the collaterals, so that the clinical effect is obvious, and the effective rate is high; and moreover, the Chinese medicinal composition is prepared from pure natural herbal medicines, does not have toxic or side effects, does not cause adverse reaction and is safe. The preparation method for the compound selenium Chinese medicinal composition for treating cardiovascular and cerebrovascular diseases is simple in process; the properties of the composition are stable and reliable; the production efficiency is high; and the production cost is low.

The invention provides a method for preparing biological nanoselenium by using Rahnella aquatilis, and belongs to the fields of microbe application and nanoselenium synthesis. The method is characterized culturing is carried out with selenate or selenite as a raw material and Rahnella aquatilis as a zymocyte, and a fermentation culturing solution is collected, separated and purified to obtain the nanoselenium. The method has the advantages of cleanness, non-toxicity, environmental protection and high efficiency, and the synthesized nanoselenium has the advantages of stable properties, few impurities, uniform particle size and good dispersion, and can be used to produce selenium-rich products. The method makes up the disadvantages of traditional methods for producing nanoselenium and the selenium-rich products to realize environmental protection and high efficiency effects, can be widely applied to fields of selenium-rich product exploitation and the like, and has good economic and social benefits.

The invention discloses an organic selenium-rich dendrobium candidum. Selenium content of the organic selenium-rich dendrobium candidum is 6.3-20 mg / kg, wherein the organic selenium content is greater than or equal to 80 percent. The invention also discloses a cultivation method of the organic selenium-rich dendrobium candidum. The cultivation method comprises the following steps of: adding a selenium source into a dendrobium candidum matrix; adding a microbial fertilizer and humic acid while adding the selenium source; and constituting a selenium-rich nutrient by the selenium source, the microbial fertilizer and the humic acid, wherein the selenium-rich nutrient comprises the components in percentage by weight: 5-20 percent of the selenium source, 5-20 percent of the microbial fertilizer and 1-2 percent of the humic acid; and the selenium source can be one or more, which are mixed at a random ratio, of selenate, selenite, selenium-containing ore processed products and nano-selenium nutrient (Suzhou Xigu Science and Technology Co., Ltd., model of XGP001A). The selenium absorption efficiency is high, and the selenium contents of different batches of dendrobium candidum are stable.

The invention discloses selenium-rich soybean sprouts and a production method thereof and belongs to the technical field of production of selenium-rich agricultural products. The production method comprises the following particle steps of: inoculating rhodopseudomonas bacteria AYGHJ-16 in a culture medium to prepare a selenium-rich bacterial agent; diluting the selenium-rich bacterial agent into selenium-rich bacterial agent diluent of which the volume is 20 to 50 times the volume of the selenium-rich bacterial agent with water; after placing soybean seeds into the 50-times selenium-rich bacterial agent to carry out seed soaking for 24 to 48 hours, enabling the soybean seeds to sprout and grow at a room temperature of 20 to 25 DEG C; in the sprouting process, spraying the soybeans with the 20-times selenium-rich bacterial agent at time intervals of 4 hours, so that after sprouting and growing for 5 to 6 days, bud seedlings grow to 8 to 10cm; and after taking out the bud seedlings, flushing the bud seedlings clean with tap water so as to obtain the selenium-rich soybean sprouts. The selenium-rich soybean sprouts produced by the method has the selenium content of 1 to 1.5mg / L, does not contain inorganic selenate or selenite and can meet the requirement of people for long-term safety selenium supplement.

The invention discloses a novel preparation method of selenated polysaccharide,specifically comprising the steps of: dissolving the polysaccharide into selenate-containing solution; freezing and drying after adjusting pH value; heating up the frozen and dried selenate-polysaccharid mixture for 1-3 days under drying condition to have a selenation reaction; and obtaining the selenated polysaccharide after dialyzing, freezing and drying, etc. The invention has the advantages that: organic solvent is not completely used in the whole preparation process and selenated products can completely avoid environment pollution; process flow is simple, condition is controllable, production cost is low, and the selenated polysaccharide is convenient to industrially produce; and the selenated polysaccharide can be taken as organic selenium supplying agent to be applied to foods, health products or fodders so as to provide selenium which is necessary for human or animal. Furthermore, the selenated polysaccharide has an immunity regulating effect and good oxidation resistance and anticancer capability, and plays an important role in developing anti-cancer drugs or cosmetics, etc.

The systems may be used for treatment of water that contains contaminants. Water containing at least one of a nitrate, percholate, chromate, selenate and a volatile organic chemical is combined with nutrients and then is processed in an anoxic-anaerobic bioreactor. The combined effluent may also be oxygenated by dosing with hydrogen peroxide or liquid oxygen. The combined effluent of the bioreactor is dosed with a particle conditioning agent. The combined effluent treated water of the bioreactor is then filtered in a biofilter to produce a treated effluent stream. The influent water and combined effluent of the anoxic-anaerobic bioreactor may also be dosed with hydrogen peroxide to control biomass content in the system.

The invention discloses cooking-free selenium-enriched snow skin mooncake pre-mixed powder. The cooking-free selenium-enriched snow skin mooncake pre-mixed powder comprises the following raw materials in parts by weight: 400-450 parts of glutinous rice flour, 100-150 parts of cassava starch, 4-13 parts of selenium-enriched cardamine hupingshanensis powder, 3-6 parts of polysaccharide selenate, 10-15 parts of erythritol, 10-15 parts of maltooligosaccharide, 1-3 parts of sorbitan monostearate, 10-15 parts of glyceryl monostearate, 4-10 parts of edible gum and 30-50 parts of water. The cooking-free selenium-enriched snow skin mooncake pre-mixed powder disclosed by the invention has the characteristics that the pre-mixed powder is cooking-free, does not need to be blended again, can be instantly used after being opened, and is high in selenium content.

The invention consists of a water treatment process using selective and regenerable weak base anion exchange resins to remove any number of complex anions, especially oxyanions including perchlorate, nitrate, chlorate, arsenate, selenate, and chromate, from aqueous solutions. The treatment process is comprised of three key processes including 1) pretreatment to lower pH, 2) ion exchange, and 3) post treatment to adjust pH and alkalinity. The invention also includes processes for regenerating weak base anion resins and treatment of the residuals generated. This invention employs pressurized treatment, carbon dioxide management, and reuse of regenerating solution to minimize pumping and treatment costs.

The invention discloses a water-soluble organic fertilizer for pitaya, and a preparation method thereof, and belongs to the technical field of agricultural planting, wherein the water-soluble organic fertilizer comprises, by weight, 0.5-0.8 part of fosamine-ammonium, 0.5-1.3 parts of daminozide, 10-20 parts of oxalic acid, 10-20 parts of citric acid, 10-20 parts of selenate, 20-30 parts of a water-soluble organic matter, 30-50 parts of pigeon manure, 20-30 parts of sheep manure, 10-20 parts of tobacco powder, 15-30 parts of mushroom residue, 10-20 parts of sesbania cannabina, 10-20 parts of alfalfa, 10-20 parts of astragalus sinicus l, 1-3 parts of a trace element fertilizer, 3-6 parts of ash formed by firing of rice hull, 0.5-1 part of fermentation bacteria, and 30-50 parts of water. The water-soluble organic fertilizer of the present invention has advantages of simple preparation method, reasonable component ratio and high nutrient content, can promote the growth and development, the high yield and the high quality of pitaya, and is suitable for large-scale promotion and use.

The invention relates to a method for preparing selenium-enriched healthy tea with high tea polyphenol and theanine. The method comprises the following steps: dissolving tea polyphenol, theanine and polysaccharide selenate in water at 80-100 DEG C to prepare a solution; dipping the raw tea in the prepared solution to obtain the functional crude tea product; and dehydrating, rolling and vacuum-drying the functional crude tea product to obtain the functional finished tea product or dehydrating and vacuum-drying the functional crude tea product to obtain the functional finished dry tea product. The method has the following beneficial effects: the content of tea polyphenol in the tea can be increased by nearly 90-130%, the content of theanine can be increased by 50-150%, the content of polysaccharide selenate (namely organic selenium) can be increased by 70-200%, the weight percentage of caffeine in the functional tea can be reduced below 0.5% and the functional tea still has the style of the traditional fixation tea.

The invention in particular relates to a preparation method of an electrolyzed water catalytic material and an application of the electrolyzed water catalytic material in water decomposition, and belongs to the technical field of preparation of electrocatalytic materials. According to the invention, stainless steel foam is used as a substrate, and selenium powder or selenate is used as a selenium source and calcined in an inert atmosphere in a tube furnace, thus the electrolyzed water catalytic material which takes the selenide stainless steel foam as an electrolyzed water catalyst and provides a larger surface area and more active centers is prepared. The selenide stainless steel foam electrocatalyst not only greatly lowers overpotentials required by electrolysis of water, but also obviously improves the catalytic performance of electrolyzed water. The catalyst produced by the invention is stable in performances, cheap and readily available in raw materials, simple to operate and easy in large-scale industrial production.

The invention discloses a method for increasing the absorption and utilization ratio of selenium-containing fertilizer under a dry farming condition. On the basis that the selenium-containing fertilizer is applied to soil, a selenium transformation accelerator and a selenium absorption accelerator are further applied to the soil. On the one hand, the transformation of a selenium-containing compound to selenate or selenite is promoted; and on the other hand, excessive H ions released by crop roots and used for being exchanged for cations are absorbed and combined to promote the absorption of selenium, so that the utilization ratio of a selenium nutritional agent can be increased by above 50 percent, the cost can be saved and the selenium are effectively enriched.

Processes for treating aqueous solutions to remove dissolved selenium species, for example in the presence of an excess of sulphate anions, which include the use of strongly basic anion exchange resins, or co-precipitation and adsorption of the selenate (and selenite) with mixed ferrous and ferric iron, or combinations thereof. Co-precipitation and adsorption of selenate may take place in an electrolytic cell in the presence of ferrous and / or ferric iron.